72154871 has 4 divisors (see below), whose sum is σ = 74643000. Its totient is φ = 69666744.

The previous prime is 72154861. The next prime is 72154877. The reversal of 72154871 is 17845127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17845127 = 41 ⋅435247.

It is a cyclic number.

It is not a de Polignac number, because 72154871 - 2⁶ = 72154807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72154877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1244021 + ... + 1244078.

It is an arithmetic number, because the mean of its divisors is an integer number (18660750).

Almost surely, 2^72154871 is an apocalyptic number.

72154871 is a deficient number, since it is larger than the sum of its proper divisors (2488129).

72154871 is a wasteful number, since it uses less digits than its factorization.

72154871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2488128.

The product of its digits is 15680, while the sum is 35.

The square root of 72154871 is about 8494.4023333016. The cubic root of 72154871 is about 416.3148330929.

Adding to 72154871 its reverse (17845127), we get a palindrome (89999998).

The spelling of 72154871 in words is "seventy-two million, one hundred fifty-four thousand, eight hundred seventy-one".